@RiccardoBlb is saying that only setWindowSize should be used at Need help with AppSettings.setWindowSize()
Yeah, that’s right. The default framebuffer size is chosen by the windows manager.
This was some sort of workaround to not break current apps and make them work properly on macos, but you are supposed to set only window size. Maybe the setResolution/setWidth/setHeight methods should be marked as @Deprecated
Incidentally what Ali_RS is suggesting there is exactly what I would have expected a windowsize/resolution mismatch to mean if allowed; a pixelated view because a small image is stretched over a too large area (or pointlessly too many pixels then downsampled). It is after all the applications resolution you’re setting, the fact that it also a framebuffer is an implementation detail